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    <title>ShellCheck: SC1081 – Scripts are case-sensitive. Use `if`, not `If`.</title>
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    <h1>SC1081 – ShellCheck Wiki</h1>
    <a href="https://github.com/koalaman/shellcheck/wiki/SC1081">See this page on GitHub</a>
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    <h2 id="scripts-are-case-sensitive-use-if-not-if">Scripts are
case-sensitive. Use <code>if</code>, not <code>If</code>.</h2>
<h3 id="problematic-code">Problematic code:</h3>
<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="SC1081.html#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="ex">If</span> true</span>
<span id="cb1-2"><a href="SC1081.html#cb1-2" aria-hidden="true" tabindex="-1"></a><span class="ex">Then</span></span>
<span id="cb1-3"><a href="SC1081.html#cb1-3" aria-hidden="true" tabindex="-1"></a>  <span class="bu">echo</span> <span class="st">&quot;hello&quot;</span></span>
<span id="cb1-4"><a href="SC1081.html#cb1-4" aria-hidden="true" tabindex="-1"></a><span class="ex">Fi</span></span></code></pre></div>
<h3 id="correct-code">Correct code:</h3>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="SC1081.html#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="cf">if</span> <span class="fu">true</span></span>
<span id="cb2-2"><a href="SC1081.html#cb2-2" aria-hidden="true" tabindex="-1"></a><span class="cf">then</span></span>
<span id="cb2-3"><a href="SC1081.html#cb2-3" aria-hidden="true" tabindex="-1"></a>  <span class="bu">echo</span> <span class="st">&quot;hello&quot;</span></span>
<span id="cb2-4"><a href="SC1081.html#cb2-4" aria-hidden="true" tabindex="-1"></a><span class="cf">fi</span></span></code></pre></div>
<h3 id="rationale">Rationale:</h3>
<p>Shells are case sensitive and do not accept <code>If</code> or
<code>IF</code> in place of lowercase <code>if</code>.</p>
<h3 id="exceptions">Exceptions</h3>
<p>If you're aware of this and insist on naming a function
<code>WHILE</code>, you can quote the name to prevent shellcheck from
thinking you meant <code>while</code>. Or if you really want the names,
add things like <code>alias If=if IF=if</code> to replace those keywords
and ask shellcheck to ignore them.</p>
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    <p style='font-size: 80%'><a href="../index.html">ShellCheck</a> is a static analysis tool for shell scripts. This page is part of its documentation.</p>
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